Provide optimised and debug mode of packages like tangogps

Description

Please provide optimised and debug mode of packages like tangogps. the normal release is printing lots and lots of information to the terminal. Even when it is started without a terminal, still all teh debug printing code is executed which is for most users not interesting information.

Prodie packages like tangogps_...opk and tangogps-debug_...opk When an advanced user is interested in the debug output, he or she can install tangogps-debug_...opk, normal users can install the optimised tangogps_..opk

Also configure the package dependancies in such a way that they prohibit simultanious installation of both packages. This might require extra funcitonality in opkg See also ​https://docs.openmoko.org/trac/ticket/2198